Magnitude 4.37 Apparent magnitude (V) 4.37 Eccentricity 0.01 | Constellation Lyra Semi-amplitude (K1) (primary) 51.6 km/s | |
Distance 156 ± 1 ly; (47.9 ± 0.4 pc) Similar Epsilon Lyrae, Eta Lyrae, R Lyrae, Gamma Lyrae | ||
Zeta1 Lyrae (ζ1 Lyr) is a binary star in the northern constellation of Lyra. Based upon an annual parallax shift of 20.89 mas as seen from Earth, the pair are located about 156 light years from the Sun. It is visible to the naked eye with an apparent visual magnitude of 4.37.
This is a single-lined spectroscopic binary system with an orbital period of 4.3 days and a nearly circular orbit with an eccentricity of 0.01. The primary, component A, is an Am star with a stellar classification of A4m. It appears to be mildly variable, with a frequency of 0.65256 cycles per day and an amplitude of 0.0032 in magnitude. The star has an estimated 2.36 times the mass of the Sun and around 2.5 times the Sun's radius. The position of this system is associated with an X-ray source with a luminosity of 571.6×1020 W.